In which type of circuit is voltage the same across all components?

In a parallel circuit, voltage remains the same across all components connected in parallel. This characteristic arises because each component shares the same two nodes of voltage supply, allowing them to experience the same electrical potential difference.

For example, if you connect multiple light bulbs in parallel to a power source, each bulb receives the full voltage from the power supply, leading to consistent brightness across all bulbs as long as they are functioning properly. This is in contrast to series circuits, where the voltage is divided among the components, resulting in different voltage levels across each one based on their resistance values.

Understanding this principle is crucial for designing circuits and predicting how they will behave under different conditions, which directly applies to many practical scenarios in electronics.